<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #app{
            border: 1px solid;
            width: 200px;
            height: 200px;
            background-image:url("img/zdy.jpg") ;
            background-position:62px 31.2px ;

            /*
                百分比参照于 container width - image width
                200 - 820 = -620
                200 - 512 = -312
            */
            /*background-position:-10% -10% ;*/
            background-repeat:no-repeat ;
        }
    </style>
</head>
<body>
    <div id="app"></div>
</body>
</html>